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nihaohao
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樓主  發(fā)表于: 2010-01-03 16:37
我們現在有40臺帶通訊功能的溫度控制儀表,想與三菱Q系列的PLC進(jìn)行通訊,主要是采集溫度儀表上顯示的數據到觸摸屏上進(jìn)行顯示,不參與溫度控制的,我想用RS-485通訊方式進(jìn)行通訊,比如說(shuō):我除了準備三菱PLC通訊模塊外,我怎么編程采集數據能,請問(wèn)有高手幫忙解答一下這個(gè)方案怎么解決,可以編一個(gè)儀表的采集小例子更好,我問(wèn)了好幾個(gè)人都不會(huì ),請用過(guò)的朋友幫解決一下,謝謝!!
zhifanxie
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1樓  發(fā)表于: 2010-01-03 20:36
我曾經(jīng)用fx2n的PLC做過(guò)一個(gè)類(lèi)似的東東,首先知道儀表的通訊的協(xié)議和格式,用RS指令(串行數據傳輸)來(lái)向各個(gè)下位的儀表傳輸指令,通過(guò)回答來(lái)知道所需要的數據,手冊上有詳細的編程例子。我沒(méi)有看過(guò)Q系列的PLC的資料,不知道是否有此功能,也不知道儀表是什么型號也不難具體說(shuō)說(shuō)。僅供參考。我因為儀表少結果還可以,不知40臺會(huì )不會(huì )影響速度。

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